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Shareholder's capital - Performance Stock Units (Detail) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Additional Disclosures |  |  |
Weighted average remaining contractual term, Exercisable | 5 years 9 months 29 days |  |
Performance and restricted share units |  |  |
Number of awards |  |  |
Beginning balance (in shares) | 2,721,207 | 2,412,043 |
Granted, including dividends (in shares) | 805,433 | 1,313,171 |
Exercised (in shares) | (865,067) | (968,470) |
Forfeited (in shares) | (217,901) | (35,537) |
Ending balance (in shares) | 2,443,672 | 2,721,207 | 2,412,043
Exercisable (in shares) | 775,674 |  |
Weighted average grant-date fair value |  |  |
Beginning balance (in USD per share) | $ 16.58 | $ 14.00 |
Granted, including dividends (in USD per share) | 19.94 | 19.31 |
Exercised (in USD per share) | 13.79 | 14.45 |
Forfeited (in USD per share) | 18.64 | 15.62 |
Ending balance (in USD per share) | 18.07 | $ 16.58 | $ 14.00
Exercisable (in USD per share) | $ 16.12 |  |
Additional Disclosures |  |  |
Outstanding, Weighted average remaining contractual term | 1 year 8 months 19 days | 11 months 4 days | 1 year 10 months 9 days
Granted, including dividends, Weighted average remaining contractual term | 2 years 9 months 7 days | 2 years |
Weighted average remaining contractual term, Exercisable |  |  |
Outstanding, aggregate intrinsic value | $ 44,646 | $ 54,560 | $ 44,309
Granted, including dividends, aggregate intrinsic value | 12,881 | 24,966 |
Exercised, aggregate intrinsic value | 17,005 | 20,105 |
Forfeited, aggregate intrinsic value | 3,981 | $ 745 |
Exercisable, aggregate intrinsic value | $ 14,172 |  |

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